Custom labels

7 Jun 201712 minutes to read

Custom labels are the text that can paste in any location of the Linear Gauge. It is used to define the purpose of the gauge.

Adding Custom label collection

Custom labels collection can be directly added to the scale object. Refer the following code to add custom labels collection in a Linear Gauge control.

HTML

<ej-lineargauge id="LinearGauge1" [height]=500 [width]=299 labelColor="grey" 
          [enableAnimation]="false" [frame.innerWidth]=8 [frame.outerWidth]=10
             frame.backgroundImageUrl="../images/gauge/Gauge_linear_light.png">
   <e-scales>
        <e-scale backgroundColor="transparent" [showCustomLabels]="true" 
         [customLabels]="customLabels" [showMarkerPointers]="false" [showBarPointers]="true"
           [border]="{ color: 'transparent', width: 0 }">
          <e-barpointers>
              <e-barpointer  [width]="10" backgroundColor="#8BABFF" [value]=91 placement="near"
                [distanceFromScale]=30 >
              </e-barpointer>
           </e-barpointers>	
          <e-ticks>
               <e-tick type="majorinterval" [width]=2 color="#8c8c8c" 
                            [distanceFromScale]="{ x: 7, y: 0 }"></e-tick>
               <e-tick type="minorinterval" [width]=1 [height]=6 color="#8c8c8c" 
                                      [distanceFromScale]="{ x: 7, y: 0 }"></e-tick>
          </e-ticks>
        </e-scale>
   </e-scales>
</ej-lineargauge>

TS

//Adding custom label collection
                this.customLabels= [{
                    value: "Mathematics Mark", position: { x: 55, y: 97 }
                }];

Execute the above code to render the following output.

Basic Customization

Appearance

• You can customize custom labels using the properties like textAngle, color and font. The API textAngle is used to display the custom labels in the specified angles and color attribute is used to display the custom labels in specified color. You can use value attribute to set the text value in the custom labels.

• To display the custom labels, set showCustomLabels as ‘true’. Font option is also available on the custom labels. The basic three properties of fonts such as size, family and style can be achieved by size, fontStyle and fontFamily. You can adjust the opacity of the label with the property opacity and the value of opacity lies between 0 and 1.

HTML

<ej-lineargauge id="LinearGauge1" [height]=500 [width]=299 labelColor="grey" 
           [enableAnimation]="false" [frame.innerWidth]=8 [frame.outerWidth]=10
           frame.backgroundImageUrl="../images/gauge/Gauge_linear_light.png">
   <e-scales>
        <e-scale backgroundColor="transparent" [showCustomLabels]="true" [customLabels]="customLabels" 
          [showMarkerPointers]="false" [showBarPointers]="true" [border]="{ color: 'transparent', width: 0 }">
          <e-barpointers>
              <e-barpointer  [width]="10" backgroundColor="#8BABFF" [value]=91 placement="near" 
              [distanceFromScale]=30 >
              </e-barpointer>
           </e-barpointers>	
          <e-ticks>
               <e-tick type="majorinterval" [width]=2 color="#8c8c8c" 
                                 [distanceFromScale]="{ x: 7, y: 0 }"></e-tick>
               <e-tick type="minorinterval" [width]=1 [height]=6 color="#8c8c8c" 
                                    [distanceFromScale]="{ x: 7, y: 0 }"></e-tick>
          </e-ticks>
        </e-scale>
   </e-scales>
</ej-lineargauge>

TS

this.customLabels = [{
    position: { x: 55, y: 87 },
    value: "Mathematics Mark",
    color: "Red",
    textAngle: 30,
    opacity: 0.5
}];

Execute the above code to render the following output.

Locating the CustomLabels

To set the location of the custom label in Linear Gauge, position property is used. You can position the custom labels in horizontal and vertical axis using X and Y axis respectively.

HTML

<ej-lineargauge id="LinearGauge1" [height]=500 [width]=299 labelColor="grey"
           [enableAnimation]="false" [frame.innerWidth]=8 [frame.outerWidth]=10
           frame.backgroundImageUrl="../images/gauge/Gauge_linear_light.png">
   <e-scales>
        <e-scale backgroundColor="transparent" [showCustomLabels]="true" 
           [customLabels]="customLabels" [showMarkerPointers]="false" 
           [showBarPointers]="true" [border]="{ color: 'transparent', width: 0 }">
          <e-barpointers>
              <e-barpointer  [width]="10" backgroundColor="#8BABFF" [value]=91 placement="near"
               [distanceFromScale]=30 >
              </e-barpointer>
           </e-barpointers>	
          <e-ticks>
               <e-tick type="majorinterval" [width]=2 color="#8c8c8c" 
                            [distanceFromScale]="{ x: 7, y: 0 }"></e-tick>
               <e-tick type="minorinterval" [width]=1 [height]=6 color="#8c8c8c"
                               [distanceFromScale]="{ x: 7, y: 0 }"></e-tick>
          </e-ticks>
        </e-scale>
   </e-scales>
</ej-lineargauge>

TS

//Adding custom label collection
this.customLabels = [
{ value: "Mathematics Mark", position: { x: 55, y: 87 } }];

Execute the above code to render the following output.

Multiple Custom Labels

You can set multiple custom labels in a single Linear Gauge by adding an array of custom label objects. Refer the following code example for multiple custom label functionality.

HTML

<ej-lineargauge id="LinearGauge1" [height]=500 [width]=299 labelColor="grey"
               [enableAnimation]="false" [frame.innerWidth]=8 [frame.outerWidth]=10
                   frame.backgroundImageUrl="../images/gauge/Gauge_linear_light.png">
   <e-scales>
        <e-scale backgroundColor="transparent" [showCustomLabels]="true" 
        [customLabels]="customLabels" [showMarkerPointers]="false" [showBarPointers]="true" 
         [border]="{ color: 'transparent', width: 0 }">
          <e-barpointers>
              <e-barpointer  [width]="10" backgroundColor="#8BABFF" [value]=91 
                                             placement="near" [distanceFromScale]=30 >
              </e-barpointer>
           </e-barpointers>	
          <e-ticks>
               <e-tick type="majorinterval" [width]=2 color="#8c8c8c" 
                                [distanceFromScale]="{ x: 7, y: 0 }"></e-tick>
               <e-tick type="minorinterval" [width]=1 [height]=6 color="#8c8c8c" 
                                         [distanceFromScale]="{ x: 7, y: 0 }"></e-tick>
          </e-ticks>
        </e-scale>
   </e-scales>
</ej-lineargauge>

TS

//Adding custom label collection
this.customLabels = [
{
    value: "Mathematics Mark", position: { x: 55, y: 87 },
    color: "Red"
},
{
    value: "Marks in %", position: { x: 15, y: 57 },
    color: "Red", textAngle: 90
}];

Execute the above code to render the following output.